Use custom config API provider. Fixes #20.

commands

@@ -5,6 +5,9 @@ set +exo pipefail
 # Fail on equation failure
 set -e
 
+# Source our custom env config API
+source "$(dirname $0)/libconfig"
+
 # Check if name is specified
 if [[ $1 == redis:* ]]; then
     if [[ -z $2 ]]; then
@@ -84,7 +87,7 @@ case "$1" in
 
     # Create REDIS_URL env variable for library / connector autoconfiguration
     dokku_log_info1 "Creating Redis autoconfiguration environment variable"
-    dokku config:set $APP REDIS_URL="redis://redis:6379/0"
+    r_config_set_redis_url
 
     dokku_log_info2 "Redis started:"
     dokku_log_verbose "Application: $APP"
@@ -174,7 +177,7 @@ case "$1" in
     fi
 
     # Remove Redis autoconfiguration variable
-    dokku config:unset $APP REDIS_URL
+    r_config_unset_redis_url
 
     dokku_log_info2 "Redis container destroyed:"
     dokku_log_verbose "Application: $APP"

libconfig

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+# Prefix functions with "r_" to prevent conflict with original
+
+ENV_FILE="$DOKKU_ROOT/$APP/ENV"
+ENV_FILE_TEMP="$DOKKU_ROOT/$APP/ENV.tmp"
+
+KEY="REDIS_URL"
+VALUE="redis://redis:6379/0"
+
+r_config_create() {
+	[ -f "$ENV_FILE" ] || {
+		touch "$ENV_FILE"
+	}
+}
+
+r_config_set_redis_url() {
+	r_config_create
+	ENV_TEMP=$(cat "${ENV_FILE}")
+
+	ENV_TEMP=$(echo -e "${ENV_TEMP}" | sed "/^export $KEY=/ d")
+	ENV_TEMP="${ENV_TEMP}\nexport $KEY='$VALUE'"
+
+	r_config_write "$ENV_TEMP"
+}
+
+r_config_unset_redis_url() {
+	r_config_create
+	ENV_TEMP=$(cat "${ENV_FILE}")
+
+	ENV_TEMP=$(echo -e "${ENV_TEMP}" | sed "/^export $KEY=/ d")
+
+	r_config_write "$ENV_TEMP"
+}
+
+r_config_write () {
+	ENV_TEMP="$1"
+
+	echo -e "$ENV_TEMP" | sed '/^$/d' | sort > "$ENV_FILE_TEMP"
+
+	if ! cmp -s "$ENV_FILE" "$ENV_FILE_TEMP"; then
+		cp -f "$ENV_FILE_TEMP" "$ENV_FILE"
+		chmod 600 "$ENV_FILE"
+	fi
+
+	rm -f "$ENV_FILE_TEMP"
+}